Michael Phelps

Associated Press
FILE - In this May 13, 2012, file photo, Michael Phelps poses for a portrait at the Olympic Media Summit in Dallas. Phelps has added another triumph to his list of accomplishments: The Associated Press male athlete of the year, Thursday, Dec. 20, 2012. (AP Photo/Victoria Will, File)

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Olympic champion Michael Phelps has announced his intention to retire after the London Olympics. 

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